WO2017174581A1 - Appareil et procédés de télécommunications sans fil - Google Patents

Appareil et procédés de télécommunications sans fil Download PDF

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Publication number
WO2017174581A1
WO2017174581A1 PCT/EP2017/057990 EP2017057990W WO2017174581A1 WO 2017174581 A1 WO2017174581 A1 WO 2017174581A1 EP 2017057990 W EP2017057990 W EP 2017057990W WO 2017174581 A1 WO2017174581 A1 WO 2017174581A1
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WO
WIPO (PCT)
Prior art keywords
random access
access procedure
terminal device
message
base station
Prior art date
Application number
PCT/EP2017/057990
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English (en)
Inventor
Martin Warwick Beale
Shin Horng Wong
Original Assignee
Sony Corporation
Sony Europe Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corporation, Sony Europe Limited filed Critical Sony Corporation
Priority to EP17715162.8A priority Critical patent/EP3245833B1/fr
Priority to US16/091,182 priority patent/US10932297B2/en
Publication of WO2017174581A1 publication Critical patent/WO2017174581A1/fr
Priority to US17/179,442 priority patent/US11497062B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • the present disclosure relates to wireless telecommunications apparatus and methods. Description of Related Art
  • MTC machine type communication
  • loT The Internet of Things
  • the 3GPP has proposed to develop technologies for supporting narrow band (NB)-loT using an LTE / 4G wireless access interface and wireless infrastructure.
  • NB narrow band
  • Such loT devices are expected to often be low complexity and inexpensive devices requiring infrequent communication of relatively low bandwidth data (e.g. MTC devices).
  • MTC devices relatively low bandwidth data
  • the increasing use of different types of terminal devices associated with different traffic profiles gives rise to new considerations for efficiently handling signalling associated with such devices. This is because approaches for efficiently handling transmissions associated with one traffic profile, e.g. frequent transmissions of large volumes of data, may be different from approaches for efficiently handling transmissions associated with another traffic profile, e.g. infrequent transmissions of small amounts of data.
  • Figure 2 schematically represents steps in a random access procedure in a wireless
  • Figure 3 schematically represents some aspects of a wireless telecommunications network configured to operate in accordance with certain embodiments of the present disclosure.
  • Figure 4 is a ladder signalling diagram schematically representing some operating aspects of terminal devices and base stations associated with random access procedures in accordance with certain embodiments of the present disclosure.
  • Figure 1 provides a schematic diagram illustrating some basic functionality of a mobile telecommunications network / system 100 operating in accordance with LTE principles and which may implement embodiments of the disclosure as described further below.
  • Various elements of Figure 1 and their respective modes of operation are well-known and defined in the relevant standards administered by the 3GPP (RTM) body, and also described in many books on the subject, for example, Holma H. and Toskala A [2]. It will be appreciated that operational aspects of the telecommunications network which are not specifically described below may be implemented in accordance with any known techniques, for example according to the relevant standards.
  • a base station to instruct a terminal device in connected mode to initiate a random access procedure by transmitting to the terminal device an instruction to do so.
  • Such an instruction is sometimes referred to as a PDCCH order (Physical Downlink Control Channel order), see, for example, Section 5.3.3.1 .3 in ETSI TS 136 213 V13.0.0 (2016-01 ) / 3GPP TS 36.212 version 13.0.0 Release 13 [3].
  • a network triggered RACH procedure (PDCCH order) may arise. For example:
  • a terminal device may receive a PDCCH order to transmit on PRACH as part of a
  • a terminal device may receive a PDCCH order so that it can establish a different RRC configuration in the subsequent RACH procedure, this may apply, for example, for a narrowband loT terminal device which is prevented from RRC reconfiguration in connected mode whereby sending the terminal device to idle mode through a PDCCH order allows the terminal device to be configured in the subsequent PRACH procedure, for example to configure the terminal device for a different coverage enhancement level (e.g. more or fewer repetitions)
  • a different coverage enhancement level e.g. more or fewer repetitions
  • the terminal device When a PDCCH order is transmitted to a terminal device, the terminal device is assigned a PRACH preamble signature sequence to use for the subsequent PRACH procedure. This is different from a terminal device triggered PRACH procedure in which the terminal device selects a preamble from a predefined set and so could by coincidence select the same preamble as another terminal device PRACHing at the same time giving rise to potential contention.
  • FIG 2 is a ladder diagram schematically showing steps of a conventional LTE random access procedure undertaken by a terminal device 104 (left-hand node in Figure 2) in response to a PDCCH order received from a base station 101 (right-hand node in Figure 2). It will be appreciated the specific reason for undertaking the PDCCH ordered PRACH is not significant to the principles described herein.
  • step S1 the base station 101 transmits signalling corresponding to a PDCCH order addressed to the terminal device 104.
  • This signalling includes an indication of a random access preamble signature sequence for the terminal device to use for the subsequent random access procedure.
  • This preamble may be selected by the base station from a pool of preambles that are not available for contention-based (terminal device triggered) random access procedures to avoid contention.
  • step S3 on receiving the transmission of the random access preamble from the terminal device in step S2, the base station 101 transmits a Random Access Response (RAR) message addressed to the RA-RNTI.
  • the RAR message contains an indication of the preamble, a timing alignment command and a temporary C-RNTI (Cell Radio Network Temporary Identity) as well as an indication (allocation / grant) of uplink resources to be used by the terminal device for the next step of the procedure.
  • step S4 assuming the terminal device receives the RAR of step S3 from the base station within a specified time window after preamble transmission in step S2, the terminal device transmits a so-called Message 3 using the uplink radio resources indicated in association with the RAR message received in step S3.
  • Message 3 conveys the appropriate higher-layer message associated with the PRACH procedure.
  • the higher-layer message might be an RRC Connection Resume message, an RRC Connection Reconfiguration Complete message, an RRC Connection Re-establishment Request message or an Uplink Information Transfer message.
  • a terminal device may be able to "piggy back" certain data, for example user plane data, on Message 3 transmissions of a random access procedure.
  • this may be particularly advantageous in respect of terminal devices needing to transmit relatively small amounts of data since this data may be transmitted in association with a random access procedure Message 3, thereby saving signalling overhead associated with establishing a separate uplink transmission for this data.
  • a base station may need to allocate different amounts of uplink radio resources to use for different Message 3 transmissions depending on the amount data to be transmitted in the Message 3. That is to say, in some implementations uplink signalling associated with a random access procedure may have a variable size. To accommodate this it has been proposed that the size of Message 3 be indicated in the random access response, RAR transmitted from the base station to the terminal device in response to the base station receiving the random access preamble from the terminal device.
  • the inventors have recognised certain drawbacks with this approach.
  • RAR messages will be transmitted frequently in wireless telecommunication systems, for example in respect of all contention and non-contention-based random access procedures, and so it would be preferable for these messages to be as simple and straightforward as possible, for example it would be preferable to support a single format for the RAR message, for both contention and non- contention based access.
  • FIG. 3 schematically shows a telecommunications system 500 according to an embodiment of the present disclosure.
  • the telecommunications system 500 in this example is based broadly around an LTE-type architecture. As such many aspects of the operation of the
  • telecommunications system / network 500 are known and understood and are not described here in detail in the interest of brevity. Operational aspects of the telecommunications system 500 which are not specifically described herein may be implemented in accordance with any known techniques, for example according to the current LTE-standards.
  • the telecommunications system 500 comprises a core network part (evolved packet core) 502 coupled to a radio network part.
  • the radio network part comprises a base station (evolved- nodeB) 504 coupled to a plurality of terminal devices.
  • a base station evolved- nodeB
  • two terminal devices are shown, namely a first terminal device 506 and a second terminal device 508.
  • the radio network part may comprise a plurality of base stations serving a larger number of terminal devices across various communication cells. However, only a single base station and two terminal devices are shown in Figure 3 in the interests of simplicity.
  • the terminal devices 506, 508 are arranged to communicate data to and from the base station (transceiver station) 504.
  • the base station is in turn communicatively connected to a serving gateway, S-GW, (not shown) in the core network part which is arranged to perform routing and management of mobile communications services to the terminal devices in the telecommunications system 500 via the base station 504.
  • S-GW serving gateway
  • the core network part 502 also includes a mobility management entity (not shown) which manages the enhanced packet service, EPS, connections with the terminal devices 506, 508 operating in the communications system based on subscriber information stored in a home subscriber server, HSS.
  • EPS enhanced packet service
  • PCRF policy charging and resource function
  • PDN-GW packet data network gateway
  • the first terminal device 506 is a conventional smartphone-type terminal device communicating with the base station 504 in a conventional manner.
  • This conventional terminal device 506 comprises a transceiver unit 506a for transmission and reception of wireless signals and a processor unit 506b configured to control the device 506.
  • the processor unit 506b may comprise a processor unit which is suitably configured / programmed to provide the desired functionality using conventional programming / configuration techniques for equipment in wireless telecommunications systems.
  • the transceiver unit 506a and the processor unit 506b are schematically shown in Figure 3 as separate elements.
  • the second terminal device 508 is a machine-type communication (MTC) terminal device 508 adapted to support operations in an Internet of Things (loT) context in accordance with embodiments of the present disclosure when communicating with the base stations 504.
  • MTC machine-type communication
  • the terminal device 508 may be a reduced capability terminal device, for example a terminal device able to operate on a restricted bandwidth as compared to conventional terminal devices (i.e. what might be referred to as a narrowband device).
  • terminal devices which are not reduced capability terminal devices, but may comprise conventional smartphone terminal devices, or indeed any other form of terminal device, that may be operating in a wireless telecommunications system (e.g. the smartphone terminal device 506 may in other cases also implement the functionality described herein for the reduced-capability terminal device 508 in accordance with embodiments of the disclosure).
  • the loT terminal device 508 comprises a transceiver unit 508A for transmission and reception of wireless signals and a processor unit 508B configured to control the terminal device 508.
  • the processor unit 508B may comprise various sub-units for providing functionality in accordance with embodiments of the present disclosure as explained further herein. These sub-units may be implemented as discrete hardware elements or as appropriately configured functions of the processor unit.
  • the processor unit 508B may comprise a processor unit which is suitably configured / programmed to provide the desired functionality described herein using
  • the transceiver unit 508A and the processor unit 508B are schematically shown in Figure 3 as separate elements for ease of representation. However, it will be appreciated that the functionality of these units can be provided in various different ways, for example using a single suitably programmed general purpose computer, or suitably configured application-specific integrated circuit(s) / circuitry. It will be appreciated the terminal device 508 will in general comprise various other elements associated with its operating functionality, for example a power source, user interface, and so forth, but these are not shown in Figure 2 in the interests of simplicity.
  • transceiver unit 504a and the processor unit 504b are schematically shown in Figure 3 as separate elements for ease of representation. However, it will be appreciated that the functionality of these units can be provided in various different ways, for example using a single suitably programmed general purpose computer, or suitably configured application-specific integrated circuit(s) / circuitry. It will be appreciated the base station 504 will in general comprise various other elements associated with its operating functionality.
  • the base station 504 is configured to communicate data with both the conventional smartphone terminal device 506 and the loT terminal device 508 according to an embodiment of the disclosure over respective communication links 510, 512.
  • the base station 504 is configured to communicate with the conventional terminal device 506 over the associated radio communication link 510 following the established principles of LTE-based communications, and in particular using conventional random access procedures such as represented in Figure 2.
  • communications between the base station 504 and the loT terminal device 508 operate using modified random access procedures in accordance with certain embodiments of the present disclosure as described herein.
  • the base station is configured to operate by communicating with different classes of terminal device (e.g.
  • Figure 4 is a ladder diagram schematically showing steps of a modified random access procedure undertaken by the terminal device 508 (left-hand node in Figure 4) and the base station 504 (right-hand node in Figure 4) represented in Figure 3 in accordance with certain embodiments of the disclosure.
  • aspects of this operation which are not specifically described herein, for example the particular signalling protocols adopted, may be implemented in accordance with conventional techniques for communicating in wireless telecommunications systems.
  • the process of Figure 4 is closely based on the conventional process of Figure 2 and aspects of Figure 4 which correspond with aspects of Figure 2 are not discussed in detail in the interests of brevity.
  • step T1 of the signalling represented in Figure 4 it is assumed the terminal device 508 is operating in an RRC connected mode with respect to the base station 504 in accordance with conventional techniques. It will be appreciated the reason why the terminal device is RRC connected to the base station and the contents of any data being exchanged between the terminal device and the base station is not significant to the principles described herein.
  • step T2 the base station 504 identifies a need to trigger the terminal device 508 to undergo a random access procedure. The specific reason why the base station determines the terminal device should undergo a random access procedure is not significant to the principles described herein.
  • the terminal device is unable to reconfigure its RRC connection whilst RRC connected, for example as has been suggested for loT type terminal devices, but the base station determines the current RRC configuration settings for the terminal device are not appropriate.
  • the base station may recognise the terminal device needs to be reconfigured to change its coverage
  • the base station may thus be aware that the terminal device has N bits of uplink data to transmit, and decides the amount of this data that should be transmitted by the terminal device in uplink signalling associated with the random access procedure.
  • the actual amount of data to be transmitted by the terminal device in the PRACH procedure e.g. the TBS for message 3
  • the base station 504 transmits signalling to the terminal device 508 to instruct the terminal device to initiate a PRACH procedure.
  • the base station may convey an indication of the transport block size to be used in association with random access procedure uplink signalling, as discussed further below.
  • the signalling of step T4 may in some cases correspond with a modified PDCCH order, in other implementations different forms of signalling may be adopted, for example the information conveyed in step T4 of Figure 4 may be conveyed by higher layer signalling, such as an RRC message.
  • step T5 the terminal device 508 responds to the instruction to initiate a random access procedure received in step T4 by initiating the random access procedure through transmission of a random access preamble to the base station.
  • This step may be performed in accordance with conventional random access procedures, for example the step may correspond with step S2 discussed above with reference to Figure 2.
  • the random access preamble signature sequence used by the terminal device for the transmission in step T5 may be based on an indication received from the base station in association with the instruction to initiate the random access procedure received in step T4 to help avoid contention.
  • step T6 after receiving the random access preamble from the terminal device in step T5, the station responds with a random access response message (RAR).
  • the RAR may be conventional, for example, and correspond with the random access response message discussed above in relation to step S3 of Figure 2.
  • a variable size message 3 can be used to allow a terminal device to transmit different amounts of data in uplink signalling associated with a random access procedure, and furthermore, this is achieved in a way which does not require a modified random access response message.
  • the terminal device is provided with an indication of the transport block size for the uplink signalling associated with the random access procedure (in this example message 3 signalling) in conjunction with a previously received instruction to initiate a random access procedure received from the base station (step T4 in this example). This can simplify RAR decoding and reduce the number of bits that need to be transmitted in RAR messages.
  • the base station 504 may provide the terminal device 508 with an indication of the size, e.g. TBS, for subsequent uplink signalling associated with a random access procedure, e.g. a message 3, in association with an instruction for the terminal device to initiate a random access procedure, e.g. a PDCCH order or higher layer signalling.
  • the base station may in association with the trigger instruction to initiate the random access procedure (step T4 in the example of Figure 4) also provide the terminal device with an indication of the random access preamble to use for the random access procedure.
  • This is an established principle for network triggered (non-contention) random access procedures in wireless telecommunications systems.
  • the specific preamble chosen by the base station for the terminal device to use in the PRACH procedure may be used to provide an indication of a subsequent uplink message size.
  • the wireless telecommunications system may allow two different sizes for message 3.
  • the preambles available for non-contention random access procedures may be divided into two groups, with one group associated with one length for message 3 and the other group associated with another length for message 3.
  • the base station can therefore select from one or other group to provide the terminal device with an indication of the size of message 3 it should use in the subsequent random access procedure.
  • the predefined associations between different preambles and message sizes may be provided in accordance with an operating standard for the wireless telecommunications systems, or may be configurable, for example through system information signalling.
  • a terminal device may itself be configured to select a preamble to provide an indication of an intended message 3 size based on a predefined association between different message 3 sizes and different preambles / preamble groups available for selection by the terminal device for contention-based random access.
  • the transport block size for the terminal device to use for subsequent uplink signalling associated with the random access procedure may be explicitly indicated in association with the signalling received from the base station to trigger the terminal device to initiate the random access procedure.
  • the signalling of step T4 may be associated with an explicit indication of the TBS to use.
  • the explicit indication of the TBS could be transmitted within an information element of an RRC message or a bit field of Downlink Control Information (DCI) transmitted on a PDCCH.
  • DCI Downlink Control Information
  • a context / cause associated with the signalling to trigger PRACH may implicitly indicate the transport block size to be used for message 3 in the PRACH procedure.
  • an instruction to initiate a random access procedure in association with a handover operation may correspond with one TBS size
  • an instruction to initiate a random access procedure to achieve re- synchronisation may be associated with another TBS size
  • an instruction to initiate a random access procedure to achieve an RRC reconfiguration may be associated with yet another TBS size.
  • a terminal device may be able to in effect determine the context of a PDCCH order from previous signalling characteristics.
  • the terminal device may assume a PDCCH order is to reconfigure the device for a different repetition rate. If the terminal device recognizes it has not received downlink signalling for some time, it may assume a PDCCH order is to achieve resynchronisation.
  • the content of the instruction to initiate a random access procedure may provide an indication of the transport block size to use for subsequent uplink signalling associated with the random access procedure (e.g. a message 3 in an LTE context).
  • the random access trigger instruction from the base station being issued to allow for RRC reconfiguration
  • different RRC configurations may be associated with different message 3 sizes.
  • the base station may provide an indication of a RRC configuration to be adopted in association with the signalling to trigger the terminal device to initiate the random access procedure, and this may indicate a particular message size for subsequent uplink signalling associated with the random access procedure in accordance with a predefined association / mapping.
  • the instruction to perform the random access procedure comprises an indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure
  • the random access procedure messages comprise at least a first message, a second message, and a third message
  • the first message comprises an uplink message conveying a random access preamble signature sequence from the terminal device to the base station to initiate the random access procedure
  • the second message is a downlink message transmitted in response to the first message and conveying an indication of an allocation of uplink radio resources to be used by the terminal for transmitting the third message
  • the third message is the variable-size uplink message.
  • the indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure comprises an indication of a transport block size, TBS, to be used for the variable size uplink message during the random access procedure.
  • a terminal device for use in a wireless telecommunications network comprising the terminal device and a base station, wherein the wireless telecommunications network supports a random access procedure comprising an exchange of random access procedure messages between the terminal device and the base station, wherein at least one of the random access procedure messages is a variable size uplink message; wherein the terminal device comprises a controller unit and a transceiver unit configured such that the terminal device is operable to: receive from the base station an instruction to perform the random access procedure, wherein the instruction to perform the random access procedure comprises an indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure; and
  • Integrated circuitry for a terminal device for use in a wireless telecommunications network comprising the terminal device and a base station, wherein the wireless
  • telecommunications network supports a random access procedure comprising an exchange of random access procedure messages between the terminal device and the base station, wherein at least one of the random access procedure messages is a variable size uplink message, wherein the integrated circuitry comprises a controller element and a transceiver element configured to operate together such that the terminal device is operable to:
  • the instruction to perform the random access procedure comprises an indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure
  • a method of operating a base station in a wireless telecommunications network comprising the base station and a terminal device, wherein the wireless telecommunications network supports a random access procedure comprising an exchange of random access procedure messages between the terminal device and the base station, wherein at least one of the random access procedure messages is a variable size uplink message; wherein the method comprises:
  • a base station for use in a wireless telecommunications network comprising the base station and a terminal device, wherein the wireless telecommunications network supports a random access procedure comprising an exchange of random access procedure messages between the terminal device and the base station, wherein at least one of the random access procedure messages is a variable size uplink message, wherein the base station comprises a controller unit and a transceiver unit configured such that the base station is operable to:
  • the instruction to perform the random access procedure comprises an indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure
  • Integrated circuitry for a base station for use in a wireless telecommunications network comprising the base station and a terminal device, wherein the wireless telecommunications network supports a random access procedure comprising an exchange of random access procedure messages between the terminal device and the base station, wherein at least one of the random access procedure messages is a variable size uplink message, wherein the integrated circuitry comprises a controller element and a transceiver element configured to operate together such that the base station is operable to:
  • the instruction to perform the random access procedure comprises an indication of a message size to be used by the terminal device for the variable size uplink message during the random access procedure

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de fonctionnement d'un dispositif de terminal dans un réseau de télécommunications sans fil comprenant le dispositif de terminal et une station de base. Le réseau de télécommunications sans fil prend en charge une procédure d'accès aléatoire comprenant un échange de messages de procédure d'accès aléatoire entre le dispositif de terminal et la station de base. Au moins l'un des messages de procédure d'accès aléatoire est un message de liaison montante de taille variable. Le procédé consiste : à recevoir, de la station de base, une instruction pour effectuer la procédure d'accès aléatoire, l'instruction pour effectuer la procédure d'accès aléatoire comprenant une indication d'une taille de message qui doit être utilisée par le dispositif de terminal pour le message de liaison montante de taille variable pendant la procédure d'accès aléatoire ; et à effectuer la procédure d'accès aléatoire par échange de messages de procédure d'accès aléatoire avec la station de base, comprenant la transmission du message de liaison montante de taille variable avec une taille correspondant à la taille de message indiquée reçue de la station de base.
PCT/EP2017/057990 2016-04-05 2017-04-04 Appareil et procédés de télécommunications sans fil WO2017174581A1 (fr)

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EP17715162.8A EP3245833B1 (fr) 2016-04-05 2017-04-04 Appareil et procédés de télécommunications sans fil
US16/091,182 US10932297B2 (en) 2016-04-05 2017-04-04 Wireless telecommunications apparatus and methods
US17/179,442 US11497062B2 (en) 2016-04-05 2021-02-19 Wireless telecommunications apparatus and methods

Applications Claiming Priority (2)

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EP16163808 2016-04-05
EP16163808.5 2016-04-05

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US16/091,182 A-371-Of-International US10932297B2 (en) 2016-04-05 2017-04-04 Wireless telecommunications apparatus and methods
US17/179,442 Continuation US11497062B2 (en) 2016-04-05 2021-02-19 Wireless telecommunications apparatus and methods

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US20200329502A1 (en) 2020-10-15
US10932297B2 (en) 2021-02-23
US11497062B2 (en) 2022-11-08

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